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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d5cd093bc26b8daeaea779cdadfd889d5b75a389c33108cb5519fb692af67f' 
  AND token = 'OpKb2PV5TcGxbK3UDe5bf/Ogt+CoBHrUIZZwy3u/cJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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