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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97bada0957f7598b6e94d5f5a82861038815c05b544e11e9792ec95a27bdab5' 
  AND token = 'ENYC89hCS3EuluNsz7mdmTpVfCQgPM8+sPYy6sUV7+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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