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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032cbb312026820ad36436a50e54f6945b15179a83172d194ec19857c4f781ae' 
  AND token = 'Mth6eBlWhFDK3l4bk2EbnFgH1BWc3DwjYtAHEDP/LhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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