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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27941384a745dab46ecd4bbcda0dcf11fe2c4caf9b4b2a2f8cdf15fefb29613' 
  AND token = 'X+gq2CtvArA7OXI6S3W142wPKD0V7+3mJmabzlMW6M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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