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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d619a11f820cc987cb7e0afbe5132b1052408f15d72f1ad5644901eb18d013' 
  AND token = 'jQz5iydkOULFCKDrHf+Ggdu5HwbVRdIE2zaE814IgHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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