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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04722ff89684a3d814b36f8c642b0d193d796a3cbcfab939bb11d97b290bac69' 
  AND token = 'MKm+C0DcGmma1kPDZJwxZNTS59/HoABNUzW6e+XD8x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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