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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863efeb0c5a959dee40bfb1981e6d8c91e31c9d652c5043ac32f1014515ff1fe' 
  AND token = 'ty57GOSrcF7mC9+m4ncWfWhhw4srdnbMo4OWrL7I5ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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