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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db012f6d0ca1cf3d36f37eaac36bcc8be5398da06675f66e298b484e68560d2a' 
  AND token = 'uMKW4V+kTHKPMU6PtlskdslALhmJbj/AUENXWc18uuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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