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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b507075bc664928831b45caba2e76b469525ec2bc36dd95dea3d5ba093878331' 
  AND token = 'sEf+iT7AI1PBwLJNbhuU1ju4Ze5tILz/0381GZWxVho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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