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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f333beadc9bbcf1a9a79c40ede6d69f007671865a6a8a24d61d440f86e2ba6d' 
  AND token = '/fjXiRYbPutsCkFhovc4aOPjohHnPbvShfH/gCz1PVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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