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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ac1e6469760e2b5ce13b9d066d2bee69bf2a1ca8b9de7dbc16311c1fa4db08' 
  AND token = 'BoQg6fORh59h37rTLaP6Zqe6D1UISbAKZnNbgRhSJ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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