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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c19eba7b1d7fca15f2c831015abd56a76f38a773fab1aca7b6b5ebcf272eeb' 
  AND token = 'OCJZW7qX7FlzBYpyEPKgYdIXxHe/8han7eKzGGyL0o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00318

JSON explain

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