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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a58de9ee94d50bcc95668fadceb527e597649e5ba41def6eafef994265a9ee5' 
  AND token = 'ySwo+AuaFOuO1PS7FWjMjcVh1Bck45xKTqIp8hZNrwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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