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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3530b261ed1fb0bbe4ec60a2ab7f33782bd2fa8f03b3fc6f273e6c5bc70e61a8' 
  AND token = 'p+7DyQJAO2xZP4Y/Yfmfd2wX6oP9RuT6PVYSkRD2msM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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