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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fde3feb8bd58d9d6795a6f3c8dd91a799f94700298d8bdc0e75fb1ed6624c0' 
  AND token = 'jzHTw/f47lzUP4Qe/1Zs0NyPx1Dc9x6VoPnH8CMfTQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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