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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b28ab79a1894dcc88158af9e5c6bca11089a0cd62f59ca5974ba82746634842' 
  AND token = '/EVeLOEFPDEXVfomGSlqbn9D906mUTmocqX9wpp0D9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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