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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c3975c3d033c8ce4433a754326319b24fb64970dd132375e105b6432fb4876' 
  AND token = '/GS6aQQ+bu/RmygEtbtvs5+s+wNX3cz8uda96hvhyas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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