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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56c5c50c73adeed9075a7d735b9b92a1dc90d135f1a30bd5240ba7bd780c937' 
  AND token = 'd0b/WoONWkoLh8H+LvBtX9qWweA0Vmp97d6blYcGtdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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