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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becda4e869f7592a0397a3fc1d3ff02d3cb15bac57d9a1f1660eaf7f13ed435c' 
  AND token = 'YDK1XdX1xGm+t4IDfTqL9cyI1gF9kn8HkT5kBnrrVFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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