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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8a4722d97059eb7c0c19193d3bfe570194ee4fffd463a05e368e46a68aab83' 
  AND token = '2JCi85SEYp8wmhIyKD78XkzZDsN9kp499KnHPBoSEUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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