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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc0e739aa66384c43cf037c729428907f73ee898a2147f4a1ae6127b8562fc3' 
  AND token = 'iC0732hs7ndmU+taWPkrrLPvqu9nwE53/RkfaauZ4BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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