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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e76988efce8396653ce50a1ca5d6af4cbd495419b5d3b86d1013309029c146' 
  AND token = '8FR83dnu46svY2xs4XCpmGkAJBrc/84gc7l26bGi+Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}