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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671a925df982fcc7b06f080c5747d2230c8a10df4107f578e899d3a3d64d22b1' 
  AND token = '0wT1o/4IpcqCk5ClbTP9D5NPIe5z59nC2y75h907WDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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