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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1936f30034dd155feb2663f5195551b2f0e23f6ff19cf0c2a88e6ef2606d32f1' 
  AND token = 'H7sBxvYA+edqgcfexJXpAAXgTuIYmAiYA5jG6iwcAeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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