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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9a64ada7473aecff1f71d2caf6091990047a966a923bad196724f87748d5e5' 
  AND token = '9dL30CWEzx7tIew2A+Vxy4wLlAO6OKsUiJ3UbEDOefg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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