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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2114c2fe90a18fa74295157dac1028919f511d81fc7799b956cfaf78f88aba' 
  AND token = 'v3J2ol2vy2DINQ4cD8PDI00onTT69O84+u0NIISeips=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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