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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb3c5a9b368ec99e40da513a6a77c5ba98fff0feef3253e3b45e1c9558b4685' 
  AND token = 'nlY2bhM3r/X3lwtPHfyXosbzXIcjm7mQMoOQAJ0GF1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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