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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2e8fb6fc4034fe83cb5af69ccd118d4b11a0d08a6131263f9db6ea98a9f4ef' 
  AND token = 'u67qHXho4d81tpnC4Fh0tpkQwGM2wyIUfyznpfALf68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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