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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21c50276138c0837bac6432ed6199c9f78b82be71c05d4dd189ab8a4265e77a' 
  AND token = 'XyV8zsa7ZlNn5Qso9rjbZ0SQR5jJyv2iKXMI/o9s6bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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