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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a4436262ec9594d4ca8fbdf31cf65460105b40bdcf4fb6b03a14cef590d8f3' 
  AND token = 'aj0cTys2yh5iwLW8r4R/DanJHFpdsJtCpsJibM02k6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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