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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7948eb1ca7b383a4cfec03744eabb075760e4cc627d0c2732d6065ce4fc1fb2a' 
  AND token = '3DV3xSkvSd4edxxxbsKFxjzU27MC00IQrIv8TeI8R2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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