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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1c6dd3ae50b900727b0817a4e4f74bee357ca7c50be76146b4c3d83ceef1ec' 
  AND token = 'dJgY9QcRhlix7R6VXmYm2mw6yCRPMYrvBiqSLTepw+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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