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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d99df7d675a82e09494ee20d948174f3a7bb277a65cfc4a1e4ae8bcf85e9754' 
  AND token = '47eqC7uIADI9QiwAoJZRIUugXXv3h6MOPwPOCy5uhHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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