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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05376bb7e6c4ac109704d46eb9d343d67aa54487ca173b1b73c4f1651ef7c11' 
  AND token = 'HL5LUUdDNhDc7eQNaMFa5H2pOyljXSVc7nC1duJqL+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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