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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013c1103e59079dc3ebac2d496b335cacb0e54af49e8d100f6a66a3e5a725518' 
  AND token = 'tL76JKVLT2f+BDpzarUorncwK/oTldzBFAbVcUSyIsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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