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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f609410e0535ef2521141f6dc4489ceefac443dadc087adc8567ffd3789fd6f' 
  AND token = 'j+o6bBbudlqu2w7VAm0gt1kpEnKRBIdN+62KAFeqtLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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