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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bbad43b164993ee77891e5847da4240d6ac50ff3e45e4dc8eadbd110dca66f' 
  AND token = 'To+a4SNLb/XTao+eY9z2ZktdVzIk/KNjIF6qfTnKJB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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