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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8beaa3906a0a59ea30724597f9b99a70c3d75d6be611de63b4c9dfcf291e8a52' 
  AND token = 'U/0B4hve2ujB9nKBuGVSqHToXLcnnBFDrjUlBV9kcQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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