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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30053bb8424790b5f1fd5b3459d6595498e6e2edd1f2819e1322b6deebc67805' 
  AND token = '8yebeHUzCd4ZOToW1Hg4sQxCkY72P2XEyQft/EEX1Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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