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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdeebe58d9e9c9494f8fd5230be6e86c10d9017b5d6bf84248dbe54d52d89a06' 
  AND token = 's5Y8clsdl7BOGKd9AWCDPNfclcYv5NC6C6xsuWZzTL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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