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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f36ff61c9b849f5b50853fc9f615a0171516b8af9535a18253ee0ee8a55c28' 
  AND token = 'R4qL4fWXOPzC2afKJT3s7SS4J2Y8Vcr6685AnXXvcEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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