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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a46968493ac386db604aaa49c3fce684090745d474ef96c2bef766924fcd48c' 
  AND token = '+/N061kjBGec5ZYFN1YnEbt87pIie5x95YfoXrYK1fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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