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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa558ee0708dc7a7e16b9a5d4538c8edd4a1f9a460428daf53019a87250e0b2' 
  AND token = 'ni2Fl8fL8aXyBon5WYO8jGwhYmjZFrYFGBYOIwdUOaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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