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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b3b758abe5f41744a0308324452576af4bccd902fde5bd9ee680bb36e1cd82' 
  AND token = '69AbrZHdz8kpUYM3r5tPltiWTX2VHny5p8SFNJmlY3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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