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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361be6585474f5d1d94d1bcebc53465d1be7bae6266a1a3bea8067a95fba0baf' 
  AND token = 'B/iuf45Xm/YQCB0OqaEbhfbv9uOA3or1DHDO0mHWI0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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