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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dceb43ba9cc84e8c50de0080dacf4fb48ec6e0243ff8524c661636f62e62c32' 
  AND token = 'EyT3LJ+38V4sWqfWSlRoq3BWqUOoP8IVGHRPVukrY9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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