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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922fe751534679d99dc69cebd57141fc13fe3f6d9c61bbf14f5de99846c405a7' 
  AND token = 'x68U5pemg05IkXPcbZulTvc3gJy/uhCmQ6fRMVJoF+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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