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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8cc8fe44f67749ed13396b58ae648ec176b334c51e9f55555581b5be125d3c' 
  AND token = 'kNY7qswrbBFLcjxYWyyZdkRH+aqX93vHMBqULEcZYLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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