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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3483bfc0bb3d6544e59e528ccfdca5c848486049ae9956e49954af1ab7de39' 
  AND token = 'XVGsiX3esCnNiD5OxQ9Tj9Ypv9zxgeHQl2T/IMhb0x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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