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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836e45cf07f7cf1ac4a60ffe171c4d77255f25f14bf03ccbbf8ab2df30d44fc7' 
  AND token = 'H1LIbo1g93kSpHJXxNtUiYhgBPD+onZH4WLPVC//VsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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