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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b98426f9155fffd24ca50e66d18dd45f6f5af08b9aa354de2bb7f4b965993fb' 
  AND token = 'cxrAC3R1dSODlImZy6Z3Lh99BPV60lmgTH4aGavdGNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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