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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3d4763cb99c926a789ee2f8d1ca5fe9e9beb2b7b323a01d706aed6f604e1a4' 
  AND token = 'hKyBq6s3+6uGlj3xFOGVbjdhfdxQc6OmRPn/bXOVK50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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