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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdb84205d45052fd2a1376df84837ba121e232f8f9dc1ccc9dfbf28150f9e98' 
  AND token = '+qI21JEtkv/BFpvEq08As6ywJZyJ0EOeUdsoNHBjP48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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