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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae69470ea3e8d331752035dd5059eb8f46f93919b0b3b81714b1390c455701ae' 
  AND token = 'A/5GUupyt8uO8slpNiHZ71AsHkgKshcAMOm05Dyo1qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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