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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d65916c3e7956934d9b28b1d1ba632493acda270483e580cf41a42ff544e939' 
  AND token = 'rKRkpgtfYMvK45WMMBvIiQ2wOg6madptFa+2odxUqk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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