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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e59d612a5efb3af83ba2fbbb0b144a6ad72fb636e85879d5e18ba24aef1d79' 
  AND token = 'OL9jxWnfoG2YYdD6Vr3f+7sch8ecXPNMkkmyG5GLwyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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