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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ad529a1e41721ef98c05958c270b24a824b5869303aac3c49d464c7291d0e2' 
  AND token = '/p4MuZGizSRZJEwGCPoWp33VdxdZDpZYb1R1jre9kcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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