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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4129b1a4cc094d08aa9f99ba1ca2b4c271f76162542f8c7136d6496324a26016' 
  AND token = '9mTI+qEErd2G5iBoGX3aB6/pLF48miDOD/+o41ZabOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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