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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3763af1e12e9f8a5e2e1471ff9d5793d93e63b4b5e74c0f1c754f644565ffd10' 
  AND token = '62zbcaRzarj5cH0ldI/b5kGoYwnLDtkDJo3WJt0LTuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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