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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afe123dd4d0478cf01dfd6a4fdc98e5c78d26b413dded5d9751ab7ce4b2864a' 
  AND token = 'IvDUMyx1Y0FAQSUBlRaExMmnoGAMJAVs7nHaMEHsySY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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