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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d655a7ed9708c982e0eea56119cddc0087049661095181f072cd4eb70359fb' 
  AND token = 'Nc61JQrK5wzu88NHX3UdpnlA1e34/FY89aP6MDMCmdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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