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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383aa7e4f639f247887ce300ed668ecda3ea00d413234294dc9ed3e4843714a3' 
  AND token = 'K++UhDQds9ny0lLPqZl0qRX3LhQmWr5uOoSn/Br2ap4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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