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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8371fca3dd9004e985acf02ac43cdd407b216b9b28bccd36e68cb7b6727200be' 
  AND token = 'KtOLlJuSpMgkokpSqSKb43DVfXaBfg6YgziZBK7BYPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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