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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdab4825e602c1f274c5cde4115830f35767d7c1ba75b93a4b1e99e863cd4ee' 
  AND token = 'tChrh2H0/XlQbvWhbNgsHKf0VQbtiShkU0YVNyM42bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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