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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bddfc1f6a1ffb1072803187b073a44f62a2fd4e92416968a02a25f94387d48a' 
  AND token = 'jJDyiP75nKvRzofjg5809N7Wajm4TNBfrj72qoVPVTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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