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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94551790ddd8bd5a4fb6b6fdd4f3f3a10d7d5afd301b26fd2dfea1cafe85a46' 
  AND token = 'rgfvrhmefjeULfX4IY0+ZbbqK9MUhHNUHqWdwRAFj/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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