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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0becbf0245c7c3385b6fde570503f37fca16d6e3060aa2b11962f0484b223a61' 
  AND token = '/U7QD2URGWndQDP5SoYk7pt/JPw5opvbf+lF4OMzCq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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