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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9518c8fa80468a5604291d4aa97b1372636cc7b3d0cece8eaf147e538f867e' 
  AND token = '7SUTWJE2ddG43gxF+HY/Urmdscu+UqFevinvZeo/xvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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