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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411b9eff384e2ea96a896d1010b2f26b76039e1c20125d1558f1edb9cce00a09' 
  AND token = 'rrPp8S1wsrZAl8lxkWcUUXp3SO4kE5yEFWC/Waw9/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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